ABC News :President Obama said today Republican presidential nominee Donald Trump is “unfit to serve as president.”In a press conference with Singapore’s prime minister, Obama added that Trump has shown he is “woefully unprepared to do this job” after his comments on military families as well as his handle on foreign affairs.”The notion that he would attack a Gold Star family that made such extraordinary sacrifices on behalf of our country, the fact that he doesn’t appear to have basic knowledge around critical issues in Europe, in the Middle East, in Asia, means that he is woefully unprepared to do this job,” the president said at the White House. Obama remarked that Republican denunciations of Trump “ring hollow” as leaders in the GOP continue to endorse Trump. “There has to come a point at which you say enough,” he said. “The question that I think that they have to ask themselves is, if you are repeatedly having to say in very strong terms that what he has said is unacceptable, why are you still endorsing him? What does this say about your party that this is your standard bearer?” Obama said. “This isn’t a situation where you have an episodic gaffe. This is daily and weekly where they are distancing themselves from statements he’s making.”